▎ 摘　　要

NOVELTY - A high heat-capacity material (18) comprises hollow elements (10) containing cryogen, and a matrix material (16) with the hollow elements embedded within the matrix material. The hollow elements are each provided with a coating of graphene or graphene oxide. USE - High heat-capacity material is used in heat storage element of cryostat used as annular spacer for superconducting magnet and annular support structure for superconducting coil and for regenerator for closed thermodynamic cycle cryogenic cooler (all claimed). ADVANTAGE - The high heat-capacity material is in direct thermal contact with superconducting coils, so no heat conducting elements are needed to transfer heat to the heat storage elements from the superconducting magnet coils and effectively minimizes rise in temperature of an equipment within a cryogen vessel and is obtained economically. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) heat storage element; (2) component of superconducting magnet; and (3) manufacture of high heat-capacity material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view explaining manufacture of heat storing nanocomposite material. Hollow elements (10) Hollow glass microspheres (12) Graphene flakes (13) Matrix material (16) High heat-capacity material (18)